抄録
When dynamic analysis is conducted, reduction of torsianl rigidity is typically configured from tenth to twentyth part of initial rigidity. So influence of torsion is treated as unimportant on concrete structures. However, we think that influence of torsion should be appropriately considered in seismic design. Therefore, we conducted cyclic loading test for RC columns loaded by axial force, bending and torsion at the same time, and formulated the reduction of torsianl rigidity. Furthermore, nonlinear dynamic analysis using the proposed fomula of the reduction of torsional rigidity of RC columns was demonstrated for a RC framed structure.
